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Add an Arbitrary instance for Syntax.

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This commit is contained in:
Rob Rix 2015-12-11 14:05:59 -05:00
parent 913d484a67
commit 68bf2cecfc
1 changed files with 7 additions and 0 deletions
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7
test/Spec.hs
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@ -24,6 +24,13 @@ unTerm :: ArbitraryTerm a annotation -> Term a annotation
unTerm arbitraryTerm = unfold unpack arbitraryTerm
where unpack (ArbitraryTerm (annotation, syntax)) = (annotation, syntax)
instance (Eq a, Eq f, Arbitrary a, Arbitrary f) => Arbitrary (Syntax a f) where
shrink syntax = filter (/= syntax) $ shrinkSyntax syntax
where shrinkSyntax (Leaf a) = Leaf <$> shrink a
shrinkSyntax (Indexed i) = Indexed <$> shrink i
shrinkSyntax (Fixed f) = Fixed <$> shrink f
shrinkSyntax (Keyed k) = Keyed . Map.fromList <$> shrink (Map.toList k)
instance (Eq a, Eq annotation, Arbitrary a, Arbitrary annotation) => Arbitrary (ArbitraryTerm a annotation) where
arbitrary = arbitraryBounded 4
shrink term@(ArbitraryTerm (annotation, syntax)) = filter (/= term) $ ArbitraryTerm <$> ((,) <$> shrink annotation <*> shrinkSyntax syntax)